Year: 2018 | Month: October | Volume 11 | Issue 5
Impact of Plant Growth Regulators and Nutrient Consortium on Growth, Superoxide Dismutase, Na+/K+ ratio and Yield of Blackgram under Salinity Stress
DOI:10.30954/0974-1712.10.2018.11
Abstract:
An experiment was conducted to study the effect of plant growth regulators like jasmonic acid (50 μM), brassinolide (0.5 ppm), salicylic acid (100 ppm), ascorbic acid (100 ppm), gibberellic acid (10 ppm), benzyl amino purine (5 ppm) and nutrient consortium (K2SO4 - 0.5% + FeSO4 - 0.5%) + Borax - 0.3%) and 1% TNAU pulse wonder on blackgram (Vigna mungo L.) variety TNAU Blackgram CO 6 under salinity condition. The salinity was imposed by 125 mM NaCl concentration in pot culture. Plant growth regulators and nutrient consortium were used as foliar spray at 20 and 40 days after sowing except jasmonic acid, which used as seed soaking. Under salinity stress, root volume, leaf area, specific leaf weight, net assimilation rate and yield were significantly reduced compared to normal condition. Among the treatments, brassinolide showed its supremacy on higher leaf area (149.13 cm2 plant-1), specific leaf weight (0.41 mg cm-2) and super oxide dismutase activity (325 Units mg-1 protein) followed by salicylic acid and TNAU pulse wonder. However highest root volume of 3.5 cc was recorded by TNAU pulse wonder. Salicylic acid registered highest net assimilation rate of 0.398 mg cm-2 d-1 followed by brassinolide (0.396 mg cm-2 d-1). The minimum Na+/K+ ratio (0.325) was observed in brassinolide followed by salicylic acid (0.355) which is on par with nutrient mixture (0.357) and TNAU pulse wonder (0.362). Among the plant growth regulators and nutrients, brassinolide recorded the maximum grain yield of 8.85 g plant-1 followed the salicylic acid (8.72 g) which is on par with TNAU Pulse Wonder (8.60 g).
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